linux-kernel - Re: [patch] drivers: wait for threaded probes between initcall levels

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Message-ID: <20061031053919.GA4726@colo.lackof.org>
Date:	Mon, 30 Oct 2006 22:39:19 -0700
From:	Grant Grundler <grundler@...isc-linux.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Kyle Moffett <mrmacman_g4@....com>,
	Linus Torvalds <torvalds@...l.org>,
	"Adam J. Richter" <adam@...drasil.com>, akpm@...l.org,
	bunk@...sta.de, greg@...ah.com, linux-kernel@...r.kernel.org,
	linux-pci@...ey.karlin.mff.cuni.cz, pavel@....cz,
	shemminger@...l.org
Subject: Re: [patch] drivers: wait for threaded probes between initcall levels

On Mon, Oct 30, 2006 at 12:13:07PM -0700, Matthew Wilcox wrote:
> Probing PCI devices really doesn't take that long.

Yeah - usually measured in "milliseconds".

> It's the extra stuff
> the drivers do at ->probe that takes the time.  And the stand-out
> offender here is SCSI (and FC), which I'm working to fix.  Firewire, USB
> and SATA are somewhere intermediate.

ISTR that the SATA Port timeout is 5 seconds or something like that.
And some cards have lots of ports...so my impression is SATA would
benefit alot from parallelism as well.

I'm certainly no SATA expert...maybe someone else could speak
more definitely on the topic of worst case SATA timeout.

thanks,
grant
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